The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 1993
Filed:
Aug. 14, 1991
Tomohiko Yamamoto, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
The power amplifying circuit embodied by the invention is composed of a single-unit circuit capable of varying own bias condition, and yet, more than two kinds of amplifying modes can selectively be activated merely by applying a single-unit power amplifying circuit. Concretely, the power amplifying circuit embodied by the invention comprises the following, a power amplifying transistor, a base-side transmission line, a resistance element connected to the base-side transmission line, the first switching element accommodating current path formed in series against the resistance element so that the first potential can be delivered to the resistance element, the second switching element which is inserted between the base-side transmission line and the second potential, and a circuit means for varying the value of a base potential of the power amplifying transistor by means of opposite switching operations performed by the first and second switching elements.